28783780216 has 8 divisors (see below), whose sum is σ = 53969587920. Its totient is φ = 14391890104.

The previous prime is 28783780187. The next prime is 28783780237. The reversal of 28783780216 is 61208738782.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1798986256 + ... + 1798986271.

It is an arithmetic number, because the mean of its divisors is an integer number (6746198490).

Almost surely, 2^28783780216 is an apocalyptic number.

It is an amenable number.

28783780216 is a deficient number, since it is larger than the sum of its proper divisors (25185807704).

28783780216 is a wasteful number, since it uses less digits than its factorization.

28783780216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3597972533 (or 3597972529 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 28783780216 in words is "twenty-eight billion, seven hundred eighty-three million, seven hundred eighty thousand, two hundred sixteen".